Christmas is just another day on the calendar for the acerbic Munch (Richard Belzer), especially when he is handed a case involving the murder of a man in a Santa Claus suit. Elsewhere, Lt. Russert (Isabella Hoffman) decides to get back into the hands-on aspects of detective work by joining Lewis (Clark Johnson) in his latest investigation -- only to discover that she has prior knowledge of the persons involved in the case. And as Felton (Daniel Baldwin) wearily prepares to spend his first Christmas without his wife and children, Bayliss (Kyle Secor) seeks out a friendly Yuletide game of Hearts -- at five dollars a hand. ~ Hal Erickson, Rovi